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2005 Impala - please help identifying noise.

 
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DannyB
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PostPosted: Wed Feb 04, 2015 4:57 pm    Post subject:  2005 Impala - please help identifying noise. Reply with quote

Hello,

This is my very first post so hello everyone.

I will try to cut a very long story short, but the gist of it is this:

I have a 2005 Impala 9C1, very low mileage (50k miles) that has had an annoying grinding sound ever since I have owned it. Sounds like someone is dragging a stone across a brick wall.

The noise is coming from the front.

The noise seems to only happen on a particular type of road surface (residential uneven roads, not smooth highway)

The noise only happens at a certain speed (about 15-20mph).

The noise can be heard under braking, coasting, and deceleration. NOT acceleration.

This happens when my hands are both on, and off the steering wheel.

I have uploaded a very short video clip of the noise at the link below.
Ignore the video crank your volume up. The noise can be heard at 14secs, 27secs, 37 secs, 48 secs, and 59 secs.

https://www.dropbox.com/s/dn2l.....7.mov?dl=0

To rule out a few things, I have had all the brakes replaced, a new steering rack, and I am running different wheels & tires for the winter (you can probably hear the studs in the video)

If anyone has any ideas what this could be, please let me know and I will send you a virtual beer

Thanks


[url][/url]
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Frank
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PostPosted: Wed Feb 04, 2015 8:25 pm    Post subject:   Reply with quote

Can you replicate it either when turning only left or only right? I haven't watched/listened to your video, but my first thought is wheel bearing/hubs...they are known to go bad in our cars.

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Impala_03
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PostPosted: Thu Feb 05, 2015 2:45 am    Post subject:  Re: 2005 Impala - please help identifying noise. Reply with quote

DannyB wrote:
Hello,


The noise is coming from the front.

The noise can be heard under braking, coasting, and deceleration. NOT acceleration.



[url][/url]



there is a rock, or dirt/mud stuck on your brake pads



is there any outstanding groves on the rotors?
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Pitch Black SS
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PostPosted: Thu Feb 05, 2015 12:28 pm    Post subject:   Reply with quote

almost sounds like a vibration, have you checked the heat shields on the manifolds / exhaust?

I had one break and it only made a sound on certain road surfaces and speeds

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DannyB
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PostPosted: Thu Feb 05, 2015 1:24 pm    Post subject:   Reply with quote

The brakes are fine, in fact it happened on my drive home from the brake shop.

The wheel hubs have been checked and are fine.

I haven't checked the heat shields, I may crawl around in there once my driveway thaws.

If anyone else has any ideas, please let me know.

Thanks
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Grape
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PostPosted: Thu Feb 05, 2015 3:04 pm    Post subject:   Reply with quote

My 2 Cents

1.) Check the crossbraces in the engine compartment for play.
Make sure the bolts holding them in haven't lost thread.

2.) Make sure there is no debris inside or around the strut boot and/or strut top plates. A rock inside one of these could lead to the grinding sound.

3.) Check the motor/trans mounts and the dog bones for play in the rubber.

4.) As PBSS stated, check the manifold heat shield and then the resonator heat shield under the vehicle. Loose heat shields could slowly grind against the bolts or other metal pieces.

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2001Ls
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PostPosted: Sat Feb 07, 2015 7:49 pm    Post subject:   Reply with quote

sounds almost like ABS kicking on-----I could be way off
just for s**t and giggles turn off the trac control and see what happens

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98ss
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PostPosted: Sat Feb 07, 2015 9:19 pm    Post subject:   Reply with quote

Does it become more exaggerated when driving side to side. Try doing the lane change like they do on motorweek. See if you get it worse on one side.
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richardgriese
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PostPosted: Thu Feb 26, 2015 12:28 pm    Post subject:   Reply with quote

It's possessed with the metric system! Anyway, did you get this solved yet?
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Frank4202
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PostPosted: Sun Mar 01, 2015 12:48 am    Post subject:   Reply with quote

Make sure the backing plate is bent away from the rotors.

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